Anyone can edit so this may be too open for some applications, for example confidential documentation. However it is possible to regulate user access.
Open to SPAM and Vandalism if not managed properly. There are easy ways to restore a page however, and on WikiEducator you must be logged in to edit pages so this reduces vandalism by automated spam bots.
The flexibility of a wiki's structure can mean that information becomes disorganised.
Technical Availability
restricted internet access
restricted number of computers
lack of basic text processing knowledge
Design
simple design limits complexity of the documents that can be created
nothing can be destroyed, but original formatting can get lost
not always obvious what has been altered
Classroom
no "real" interaction, but text based only
reliable sources
copy-paste-phenomenon
Conclusion: foster interaction and monitor work in order to expand communicative skills
Possible Disadvantages
Wiki
Technical Availability
Design
Classroom
Conclusion: foster interaction and monitor work in order to expand communicative skills